Stanislas Wawrinka claims he is 'happy with the improvement' being made on his return from a long-term knee injury absence.

Wawrinka happy with knee progress

Wawrinka happy with knee progress

The 32-year-old Swiss star missed the second half of 2017 because of the injury which required surgery and, while he managed to make his comeback in the Australian Open last month, he only made it to round two before being eliminated by Tennys Sandgren.

Wawrinka is now aiming to bounce back from his Melbourne disappointment with a run-out at this week's ATP Sofia Open in Bulgaria and the three-time Grand Slam winner is adamant his fitness is continuing to improve.

He told the ATP website: 'I am feeling much better. Since the first day I came back from Australia I was working really hard physically and also for my tennis.

'I am feeling better and better and starting to come back to my top level. I am happy with all the improvement I am making and I am happy to be back on the [ATP World] Tour.'

He added: 'I always come into tournament to play my best tennis. [Winning the title] is not the goal you are putting in your head before a tournament. It is to be ready for the first match.

'I didn’t play for six months and I had only one tournament in Australia. So I think it isn’t easy.

'I know what I can do, I know what my level can be when I am playing good tennis. But first of all I am really happy to be back on the tour.'